FR2472006A1 - INK COMPOSITION FOR LITHOGRAPHY WITHOUT WATER AND PRINTING METHOD - Google Patents

Abstract

THE PRESENT INVENTION CONCERNS AN INK COMPOSITION FOR WATERLESS LITHOGRAPHY, CONSISTING ESSENTIALLY OF 15 TO 35 BY WEIGHT OF A RESIN LIKE A VEHICLE, 15 TO 25 BY WEIGHT OF A SICCATIVE OR SEMI-SICCATIVE OIL, 15 TO 45 BY WEIGHT OF 'A MINERAL OIL AND ABOUT1 TO ABOUT 40 BY WEIGHT OF A COLORING MATERIAL. ACCORDING TO THE INVENTION, THE MINERAL OIL INCLUDES HIGH BOILING POINT OIL SOLVENT MIXTURES HAVING A BOILING POINT GREATER THAN 200C AND CONTAINS LESS THAN 5 BY VOLUME OF AROMATIC COMPONENTS. THE INVENTION APPLIES IN PARTICULAR TO LITHOGRAPHIC PRINTING.

Description

The present invention relates to an ink composition for

  waterless lithography, having a good printing property, for printing from a lithographic printing plate with a fluid without using any kind of water dispensing system to mask a non-image area and it relates

  also to the printing process.

  In lithographic printing that uses the property of the oily ink and the water to repel each other, a printing plate comprising lipophilic image areas and hydrophilic areas (receptors of the water) without image, is provided with a

  dispenser solution and an oily ink (impres-

  two-fluid solution), and the oily ink adheres only to the areas of the image and is transferred to a printing material. But the power control of the dispenser solution and the oily ink is very difficult and requires a lot of address, and a bad

  control results in problems such as fouling

  and the lubrication, due to emulsification, poor reproduction of half-heads, low gloss and the accumulation of a phenomenon of accumulation from the to the

  low water resistance of the paper.

  To solve these problems of the traditional lithographic printing technique using a dispenser solution and to obtain a good quality printed material by an efficient printing operation, numerous studies have been made on the technique of waterless lithography, and some of them are used on a commercial scale. In water-free lithography, a low-surface-area silicone-based low-adhesion layer is formed on a non-image area, while a lipophilic layer is formed on the areas of the image, so that pock the oily ink adhesion to areas without

  image (see U.S. Patent No. 3,511,178).

  The traditional printing ink designs for waterless lithography are intended to pocket the adhesion of the ink to the non-image areas by either increasing the viscous state of the ink (thereby increasing the molecular attraction between the ink particles), or by adding an organopolysiloxane or ink-like material (see Japanese Patent Publication No. 11287/75) or using an auxilicon modified resin as an ink carrier (see Japanese breveib publications). No. 10124/76, No. 22405/76, No. 10041/77, No. 10042/77 and others). The first type of ink is not effectively

  transferred from the roll or blanket to a printing material

  if we. In addition, leveling the ink on a material

  print is bad, and gives a low gloss.

  In addition to these defects, the last type of ink forms an ink film having low energy on a printing material, so trapping on the previously printed ink layer is not sufficient in

multicolored printing.

  The ink of the first type has another defect, indeed, although there is neither fouling nor lubrication in the non-image areas (ie the bottom), when the temperature of the press printing is weak when the press is switched on, when the temperature of the plate increases during continuous printing or during the hot summer season, lubrication is observed and

excessive fouling

  Furthermore, in the traditional design of waterless lithography printing ink, it has been proposed that a material selected from the group consisting of esters, ethers, aldehydes, ketones, alcohols and mixtures thereof, is added to printing ink. However, this does not give good printing properties for lithography without water (see publication of the patent

Japanese 121807/79).

  The subject of the present invention is therefore a waterless lithography ink composition having

  good print properties, a partial transfer

  particularly good at a printing material, and giving a

  printed matter having a very good gloss.

  Another object of the present invention is a printing method using the ink composition for

  lithography without water, which has good printing properties

  in particular a good transfer to a printing material, and which gives a printed matter having

-a good shine.

  Other objects and advantages of the present invention will become more apparent to those skilled in the art.

  in this respect on reading the description which follows.

  The present invention relates to a composition

  waterless lithography ink consisting essentially of

  from about 15 to about 35% by weight of a resin as carrier, about 5 to about 25% by weight of a drying or semi-drying oil, about 15 to about% by weight of a mineral oil, and about 1 to about% by weight of a coloring matter, said mineral oil consisting of high boiling point petroleum solvent mixtures having a boiling point above 2000C and containing less than 5% by volume of aromatic components . Furthermore, the present invention relates to a waterless lithography ink composition wherein, in addition to the above, all or part of the drying or semi-drying oil is replaced by a member selected from the group consisting of an aliphatic acid ester, an aliphatic dibasic acid ester, a phosphoric acid ester and mixtures thereof, this element having a boiling point greater than 2000C, and a

  coagulation point less than -51C.

  High boiling petroleum solvent mixtures have generally been used in lithographic printing ink, which solvent mixtures contain more than 5% by volume of an aromatic component.

247200 6

  such as alkyl benzene, alkyl naphthalene, acetylene,

  naphthene, biphenyl, fluorene, anthracene and the like. On the other hand, high boiling petroleum solvent mixtures for use in the present invention contain less than 5% by volume of aromatic components. This last solvent, compared to the first, has a strong point of aniline, and causes changes in viscosity when the ambient temperature is low, especially in winter due to the strong pour point, with the result that sticking phenomena . Therefore, it has not been used traditionally as

  solvent for a lithographic printing ink.

  Solvent mixtures with a high boiling point

  According to the present invention, there is a strong "solvent release" with respect to the resin as the vehicle used in the ink. When the printing ink contacts non-image areas of the waterless lithographic printing plate, the ink film can be peeled from the non-image areas without ink. As a result, it prevents fouling or greasing of the non-image areas and a material can be obtained.

printed good quality.

  The waterless lithography ink composition is a good composition having practical printing properties and effects. However, this ink composition does not have sufficient printing properties to increase the temperature of the plate due to fast printing of long duration. And when it is at a low temperature, especially in the winter, it poses some problems: the ink becomes tacky and the printed materials have a relatively poor gloss and poor drying characteristics, and there is a film of foam on the surface. ink during storage. These defects have been solved without difficulty by replacing all or part of the drying or semi-drying oil with a member selected from the group consisting of an aliphatic acid ester, a dibasic aliphatic acid ester and phosphoric acid and

a mixture of them.

  In the following, without limiting the invention, specific examples of mixtures of petroleum solvents with high boiling point will be given below. Solvent Manufacturing Components Aromatic boiling point o C contents (% by volume) Final Final Absorbance Hexron Research Co. 2 222 - 271 420 800 Oil 5 Texaco Inc. 0 260 - 321 Floor Magic 44 Magic Bros oil Co. 0 226 - 260 Floor Magic 47 "0 230 - 273 Floor Magic 52" 0 265 - 316

Oil 620 deodorant

  "0 288 - 372 Oil 1108 Witco Chemical Co. O 280 - 324 Oil 1102" 0 266 - 325 Heavy fuel oil Metro oil & Chemical Co. 3,260 - 315 Heavy fuel oil Amsco Solvents & Chemi- 3 270 - 326 cal Co PKWF 1/3 af Johann Haltermann GMBH. 2 210 - 230

PKWF 4/7 S 5 235 - 265

PKWF 4/7 af "2 240 - 270

PKWF 6/9 S "5 260 - 290

PKWF 6/9 af "2 260 - 290

PKWF 28/31 "2,280 - 310

  ii. The esters, such as an ester of an aliphatic acid and an ester of an aliphatic dibasic acid, for use in the present invention, must meet the above conditions, otherwise they are considered unacceptable because of Other effective compounds are hexyl butyrate, heptyl butyrate, octyl butyrate, amyl valerate, hexyl valerate, heptyl valerate, and the like. octyl valerate, butyl caproate, amyl caproate, hexyl caproate, heptyl caproate, deoctyl caproate, propyl heptylate, butyl heptylate, vinyl heptylate, heptylate of hexyl heptyl heptylate, octyl heptylate, ethyl caprylate, propyl caprylate, butyl caprylate, amyl caprylate, hexyl caprylate, heptyl caprylate, octyl caprylate, methyl pelargonate, ethyl pelargonate, methyl caprate, ethyl caprate, octyl caprate, ethyl oleate, propyl oleate, butyl oleate, amyl oleate, heptyl oleate, methyl elaidate, propyl elaldate, butyl elaidate, amyl elaidate, dibutyl oxalate, dibutyl malonate, diethyl succinate, dibutyl succinate, diethyl azelate, dibutyl sebagate, dioctyl sebacate, dimethyl maleate, diethyl maleate, dipropyl maleate, dibutyl maleate, diamyl maleate, dihexyl maleate, maleate

  of diheptyl, dioctyl maleate, dimethyl fumarate

  tyl, diethyl fumarate, dipropyl fumarate,

  dibutyl fumarate and the like.

  As effective phosphoric acid esters in the present invention, there may be mentioned

  tributyl, triamyl phosphate, trihydrogen phosphate

  hexyl, triheptyl phosphate, trihydroxyphosphate

  octyl, tributoxyethyl phosphate, phosphate

trichloroethyl and the like.

  These high-boiling petroleum solids must not contain more than 5% by volume of aromatic components, otherwise fouling and greasing of the non-image areas occur. The amount of the high boiling petroleum solvent mixtures to be used in the ink is determined by the other components of the ink, particularly the resin as a carrier, but to obtain an ink composition having good toner properties. lithographic printing without water, it takes 15 to 45% by weight, preferably 20% by weight of the solvent on the basis of the total amount

the composition of the ink.

  In the case of less than 1% of an ester of an aliphatic acid, an ester of an aliphatic dibasic acid or an ester of a phosphoric acid for use in the ink, this poses some problems: fouling and greasing are observed during fast and long printing, the viscosity of the ink changes when it is at a low temperature, the printed materials have a relatively poor gloss and a bad setting time. If the quantity is greater than 20%, the viscosity of the ink becomes low, this can adversely affect the properties

  and other improvements can not be achieved.

  ration. It is possible to use, in combination, an oil

  traditional drying or semi-drying.

  The ink composition according to the invention contains resins as a vehicle used in traditional lithographic printing inks, such as phenolic resin, rosin-modified phenolic resin, alkyd resin, rosin ester resin, petroleum resin and maleic resin and the like. Drying or semi-drying oils may be used as linseed oil, tung oil, safflower oil and the like. A high boiling point petroleum solvent mixture having a boiling point between 200 and 3000 ° C. can be used as a mineral oil, but can be controlled by the amount of the high boiling point petroleum solvent mixtures specified herein. invention; the aromatic components in high boiling petroleum solvent mixtures in total in the ink composition must be formulated to be less than 5% by volume. Various traditional organic and inorganic pigments can also be used as coloring matter. Moreover,

  well-known additives used in conventional inks

  Examples of lithographic printing can be used, for example waxes such as paraffin wax, amide wax, montan wax, carnauba wax and the like; a drying agent such as a cobalt, manganese or lead soap of naphthenic or octanoic acid; an anti-foaming agent; an anti-smudging agent

and the like.

  An ink varnish can be produced, for example, from these materials by the following process: a mixture of the resins defined above and the oil

  drying or semi-drying is heated to a temperature of

  greater than the softening point of the resin to form a varnish and, to the varnish, the high-boiling petroleum solvent mixtures specified in the present invention, together with the high-point petroleum solvent mixtures are added traditional boiling required. To make a hot-curable type printing ink, a solvent having an initial boiling point of less than 260 ° C. is desirable. For the

  type hardenable hot, a point above 2601C is required.

  An ink composition can be produced from the varnish thus prepared by grinding and dispersing a colorant in the varnish in a conventional manner, and adding the additives mentioned above as the

  wax, the drying agent and the pigment if necessary.

  The present invention will be better described with reference to the following examples, which should in no way

limit the framework.

2472006.

Synthesis 1.

  A mixture of 50 parts of a rosin-modified phenolic resin (Tamanol 361 from Arakawa Chemical Co. Ltd), 10 parts of linseed oil and 40 parts of each of the high-boiling petroleum solvent mixtures identified hereinafter was heated to 200 C

  to form a varnish of the type that can take heat.

  Seven varnishes of ink were prepared in this way and

  identified as ink varnish I to 7.

  Absorption oil (2% aromatic components) ....... Ink varnish 1 Magic Ground 44 (0% ") ....." 2 Magic Sol 47 (0% ") .... . "3 PKWF 1/3 af (2%") ..... "4

PKWF 4/7 S (5% ") ....." 5

  PKWF 4/7 af (2% ") ....." 6 Magic Sol 440 (10% ") ....." 7

Synthesis 2.

  A mixture of 45 parts of rosin-modified phenolic resin (Tamanol 352 from Arakawa Chemical Co., Ltd), 15 parts of linseed oil and 40 parts of each of the high-boiling petroleum solvent mixtures identified therein. afterwards was heated to 200 ° C. to form a varnish for printing on the fabric. Seven varnishes of ink were prepared in this way and identified

by ink varnish 8 to 14.

  Magic ground 52 (0% of aromatic components) ...... Ink varnish 8 Oil 1180 (0%) ...... "9 Heavy fuel oil (3%") ...... " 10

PKWF 6/9 S (5 ") ....."

PKWF 6/9 S (5% ") ...

2472006.

  l1 PKWF 6/9 af (2% aromatic components) ... Ink varnish 12 PKJF 28/31 (2%)) .... o 13 Floor Magic 500 (12% ") ....." Examples 1 to 6, Six ink compositions were prepared from mixtures of 79 parts of varnishes I to 6, 20 parts of phthalocyanine blue, 1 part of wax by

  traditional technique of grinding and dispersing.

  Inks have been identified as dvencre compositions

1 to 6.

  Comparative Example No. 10 Comparative Filter No. 1 was prepared from the same formula as that used in Example I but replacing varnish 1 with varnish 70

Comparative Example No0 2.

  Comparative ink No. 02 was prepared of the same formula as that used in Comparative Example No. 1 but replacing 79 parts of lacquer 7 with liquid silicone (SH 510 from Toray Industries, Inc.). No. 1 Heat-shrink printing was performed on a rotary offset press (System 18, four-color printer from Komori Printing

  Machinery Co., Ltd) with a litho printing plate

  waterless graph (product of Toray Industries, Inc.) using ink compositions I to 6 and comparison inks Nos. 1 and 2. On the printed matter, the presence of dirt or grease in

  areas without image, or trapping as well as gloss.

  The results are shown in Table I which follows.

247. o.

2472006 1

Table 1.

1c For processes

see below.

Examples 7-12.

  Six evaluation compositions of each ink factor were prepared from mixtures of 77 parts of lacquers 8 to 13 of synthesis 2, 20 parts of phthalocyanine blue, 1 part

  of wax and 2 parts of a drying agent, by the technique

  than traditional grinding and dispersion. Inks

  have been identified by compositions 7 to 12.

Comparative Example No. 3.

  Comparative ink No. 3 was prepared from the same formula as used in Example 7 but replacing ink varnish 8 with ink varnish 14.

Example of

comoaraison No. 4.

  The comparison ink No. 4 was prepared from the

  same formula as that used in the comparison example

  No. 3, but replacing 5 of the 77 parts of the varnish 14 with liquid silicone (SH 510 from Toray Industries, Inc.).

Print test.

  An impression was made on a sheet fed offset press (new Komori Printing Machinery four-color printing machine) Example comparison example

1 2 3 4 5 6 1 2

Encras-

  pretty good good good good good good bad

  Trapped- good good good good good good good bad-

Bilnge bnbnbn onovais

  Brillau good good good good good good good pass

ble i

13 -

  Co., Ltd) with a waterless lithographic printing plate (produced by Toray Industries, Inc.) using ink compositions 8-13 and comparative inks

  3 and 4. The printed matter was checked for

  or lubrication in non-image areas, trapping

  and the brilliant. The results are shown in Table 2-

following.

Table 2.

  Thus, the ink composition containing the high boiling petroleum solvent mixtures specified in the present invention has printing properties suitable for lithographic printing without water to achieve the desired object with very good results. adaptability to the temperature increase of the lithographic printing plate without the coagulation force of the ink being increased too much or without the inherent characteristics of the ink

  lithographic printing is damaged.

Synthesis 3.

  A mixture of 50 parts of a rosin-modified phenolic resin (Tamanol 361 from Arakawa Chemical, Co., Ltd), 10 parts of ester (a combination of two or more esters was mixed to equal weights) below and 40 parts of each of the high boiling point petroleum solvent mixtures identified Example Example of _ _ a .. 1- - - ______p ___compa reason 7 8 9 10 il 12 3 4 Encras- good good good good good good badly enough

  Trapped- good good good good good good good bad-

ge. am going to

  Brill- good good good good good good good passa-

  The following example was heated to 200 ° C. to form a heat-type varnish. 11 ink varnishes were

  prepared in this way and identified by varnish 21 to 31.

  Absorption oil (2% of aromatic components) .......... ink varnish 21 dibutyl maleate (boiling point: 220 C, melting point: -11, 2 C) -Magic Sol 44 (0% aromatic components) ... ink varnish 22 dibutyl sebacate (boiling point: 345 C, melting point: -11 C) Magic Sol 47 (0% aromatic components) ... ink varnish 23 butyl oleate- (boiling point: 228 ° C, melting point: -10 ° C) -PKWF 1/3 af (2% aromatic components) .... 24 phosphate ink varnish of tributyl (boiling point: 289 C, melting point: 80 C) oPKWF 4/7 S (5% of aromatic components) ..... ink varnish 25 trioctyl phosphate (boiling point: 220 -250 ° C (5 mmHg), melting point: -70 ° C) _PKWF 4/7 af (2% aromatic components) .... ink varnish 26 trichloroethyl phosphate (boiling point: 210-220 ° C) (20 mmHg), melting point: -20 ° C) -Side Magic 47 ................................. ink varnish 27 dibutyl sebagate and butyl oleate. oo -Magie Sol 47 ....................... ink varnish 28 dibutyl sebacate and tributyl phosphate Magic Sol 47 ......... ............. 00 ink varnish 29 dibutyl sebacate, butyl oleate and tributyl phosphate _Magie Sol 440 (10% aromatic components) ... 0000. ink varnish 30 dibutyl maleate -dece3 Magic Sol 440 ..................... ink varnish31 tributyl phosphate Synthesis 4e A mixture of 45 parts of a modified phenolic resin with rosin (Tamanol 352 from Arakawa Chemical Co. Ltd.), 15 parts of ester (a combination of two or more esters was mixed to equal weights), identified hereinafter, and 40 parts of each of the solvent mixtures of High boiling point oil identified below was heated to 200 ° C to form a varnish for foil-fed printing. 11 varnishes were prepared in this manner and identified by ink varnish 32 to 42 -Magie Sol 52 (0% of aromatic components) ... 00000 .. dibutyl fumarate varnish (boiling point: ink 32 285 C, melting point: -20 C) - oil 1180 (0% aromatic components) .. ... dibutyl sebacate varnish (boiling point: ink 33 346 C, melting point: -11 C) - Mineral heavy oil (3% by weight) omposants - aromatic) .....................

  ......... octyl caprate varnish (boiling point: 34 306 C, melting point: -15,1 C) -PKJF 6/9 S (5% aromatic components) dioctyl soap varnish (boiling point: 375 ° C, melting point: -55 ° C) -PKWF 6/9 af (2% aromatic components) .... phosphate varnish tributyl (boiling point 36 ° C: 289 ° C, melting point: -80 ° C) -PKWF 28/31 (2% aromatic components) ..... trioctyl phosphate varnish (boiling point) - ink 37 tion: 220-250 C (5 mmHg), melting point: -70 C) _Huile 1180 ........................ .......... DTD: .. ink varnish 38 dibutyl sebacate and octyl caprate -Oil 1180 .................... ................ varnish dibutyl sebacate and ink sebacate 39 dioctyl Oil 1180 ..................... .............. DTD:. dibutyl sebacate varnish, octyl caprate and ink 40 dioctyl sebacate -Magie Sol 500 (12% aromatic components) .................. DTD: .. ............... ink varnish 41 ink dibutyl sebacate 41 Magic Sol 500 .................... ............ 42 trioctyl phosphate ink varnish..DTD: Examples 13-21.

  9 ink compositions were prepared from mixtures of 79 parts of ink varnish 21 to 29, 20 parts of phthalocyanine blue and a portion of wax by the traditional dispersion technique and

  grinding. Inks have been identified as composi-

13 to 21.

  Comparison examples Nos. 5 and 6.

  Comparative inks 5 and 6 were prepared from the same formulation as that used in Example 13 but replacing the varnish 21 with

varnish 30 and 31.

Print test.

  Heat-shrink printing was performed on an offset rotary press (System 18, Komori Printing Machinery Coc9 Ltd. Four-Color Printer) with a water-free lithographic printing plate (produced by Toray Industries, Inc.) using the compositions. to 21 and the comparison inks 5 and 6o On the printed materials, fouling or greasing was verified in the non-image areas, trapping, gloss, dryness and adaptability at low temperature. The results are shown in Table 3

following.

Table 3.

PQ h. CD cmJ,

example of

- - ___Example _ ecomparison Ex.

13 14 15 16 17 18 19 20 21 5 6 1

- t - - ma- ma--

  Cleansing excel. excel. excel. excel. {excel. excel excelexcel.excel. Well ... well ......... _______________________________________________________________________________________________ excel. excel. excel. excel exceL excel.excel.excel. good good good SicCité good good Gives good good good good good good good good passa -.................. -bl

Adaptabi-

  good good good good good good good good good good good

low temp

temperature i. -w,

2472006.

Examples 22 = 30.

  Nine ink compositions were prepared from mixtures of 77 parts of the coatings 32 to 409 of 20 parts of phthalocyanine blue, 1 part of wax and 2 parts of drying agent by the conventional grinding and dispersion technique. Inks are identified

by compositions 22 to 30.

  Comparative Examples Nos. 7-8 Comparative inks 7-8 were prepared from the same formulation as used in Example 22 but replacing ernis 32 with varnishes 41 and 420

Print test.

  A sheet feed printing was performed on a sheet fed offset press (Komori Printing Machinery Coo's new Cony Four-Color Printing Machine) with a waterless lithographic printing plate (a product of Toray Industries, Inc.) using the ink compositions 22 to 30 and the comparison inks 7 and 80 The printed materials, fouling or greasing in the non-image areas, the trapping, the gloss, the dryness and the adaptability to low temperature. The

  The results are shown in Table 4 below.

Table 4.

example of

Example cmp__ -dem Example oxpal.e.22 23 24 25 26 27 28 29 30 7 8 8

  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - excel. excel. excel. excel excel. excel.excel. I'm going well trapping good good good good good good good good good good good good., _ i

passa-

  Shiny excel excel, excel. excel. excel. excel excel. excel, excel, good passa

passa-

  Sicoity good good good good good good good good good good good

Adaptabili mau-

  tee at low- good good good good good onne good good good good bonn vaise

temperaments

ture i _. i. CD. Q> o 'i

2472006.

  As can be appreciated from reading the above results, waterless lithography ink compositions according to the present invention also have

  printing properties suitable for lithographic printing

  waterless graphics and are particularly suitable for increasing the temperature of the printing plate and they have a good or excellent gloss, very good dryness and a very good adaptability to low temperatures. In the case where the high boiling petroleum solvent mixtures specified in the present invention are not used, even if an aliphatic acid ester is used, an ester of an aliphatic dibasic acid is used. and / or an ester of a phosphoric acid, the ink composition does not have

  sufficient printing properties for lithography

waterless graphism.

  Each factor above has been evaluated as follows:

  Fouling: a printed matter without fouling

  neither lubrication formed in the non-image areas at a plate temperature of 5Q0 or more, was evaluated

  as "excellent", a material having no fouling

  at a temperature between 40 and 500C was evaluated

  as being "good", and a material having no fouling

  at a temperature between 30 and 400C was rated as "fair", a material with fouling

  at 300C or less having been assessed as "bad".

  Trapping: the trapping of the ink in a multicolored print was checked by eye and evaluated

as being "good" or "bad".

  Gloss: A printed matter having a gloss of 60 or more by measuring with a measuring apparatus at a reflection angle of 600 was rated as "excellent", - a material having a gloss between and 60 was evaluated as being "good", a material having a gloss between 45 and 55 was evaluated as

  being "passable" and a material having an inferior gloss

  45 was rated as "bad".

2472006,

  Adaptability at low temperatures: in the printing at a temperature of 50C, we checked the

  transferring ink to a printing material and removing it

  printing paper and evaluated as "good" or "bad". Siccity: the property of setting or hardening of the ink on a printed matter and the transfer of the printed matter have been verified and evaluated as "good" or "bad" on the basis of the ink compositions of the

  examples 1 and 8 which have been rated as "fair".

  Of course, the invention is not limited to the embodiments described which have been given by way of example. In particular, it includes all the means constituting technical equivalents of the means described, and their combinations if they are executed according to its spirit and implemented

  as part of the protection as claimed.

2472006;

Claims (5)

1. Waterless lithography ink composition, of the type consisting essentially of about 15 to about 35% by weight of a resin as a carrier, of the order of 5 to about 25% by weight of drying or semi-drying urail, of the order of 15 to about 45% by weight of a mineral oil and of the order of I to about% by weight of a coloring matter, characterized in that said mineral oil contains high-boiling petroleum solvent-mixtures having a boiling point above 200 ° C., and contains less than 5% by volume of aromatic components. Composition according to claim 1, characterized in that all or part of the above-mentioned drying or semi-drying oil is replaced by an element selected from the group consisting of an aliphatic acid ester, an aliphatic dibasic acid ester, a phosphoric acid ester and their mixtures, said element having a point of ullition greater than 200 C, and a coagulation point less than -5 Co 3o Composition according to any one of claims 1 or 2, characterized in that the aforementioned mineral oil having an initial boiling point of less than 2600C is used 4. Composition according to any one of claims 1 or 2, characterized in that a mineral oil having an initial boiling point above 2600C is used for a feed-in printing. 5. Composition according to any one of claims 1 or 2, characterized in that the abovementioned mineral oil comprises high-boiling point sclurant-petroleum mixtures containing less than 5% by volume of aromatic compounds and solvent mixtures of 2472006! high boiling point oil containing more than 5% by volume of aromatic components, the amount of said aromatic components in said total solvent mixture being less than 55% by volume.   6. Composition according to claim 2, characterized in that all or part of the aforementioned drying or semi-drying oil is replaced by a member selected from the group consisting of an aliphatic acid ester, an acid ester aliphatic dibasic and their mixtures.   7. Composition according to claim 6, characterized   in that the aliphatic dibasic acid ester   aforementioned is a sebasic dibasic ester.   8. Composition according to claim 2, characterized   in that all or part of the aforementioned drying or semi-drying oil is replaced by an ester phosphoric acid.   9. Lithographic printing process   The present invention provides the following ink composition on a waterless lithographic printing plate in the absence of any kind of water dispensing system to mask the non-image area, and to transfer the ink to a printing material; said ink composition consisting essentially of about -15 to about 35% by weight of unesein as a carrier, about 5 to about   about 25% by weight of a drying or semi-drying oil   drying, about 15 to about 45% by weight of a mineral oil and about 1 to about 40% by weight of a coloring material, said mineral oil comprising   petroleum solvent mixtures with high boiling point   with a boiling point greater than 2000C and   containing less than 5% by volume of aromatic components.   10. Process according to claim 9, characterized   in that all or part of the drying or semi-drying oil   said drying agent is replaced by an element selected from the group consisting of an aliphatic acid ester, an aliphatic dibasic acid ester, a phosphoric acid ester and mixtures thereof, said element having a boiling point greater than 200 C and one pdnt of coagulation less than -5 C.